Dewight needs to restrict the domain of the cosine function so that the inverse is a function. Which description best describes how she could restrict the domain?
A) So that y = cos(x) is always decreasing
B) So that y = cos(x) only has one maximum <my choice
C) So that y = cos(x) only has one minimum
D) So that y = cos(x) only has two maximum
3 answers
nope. If it has a maximum, then the graph turns back on itself, so it fails the horizontal-line test.
so that means it would always be decreasing?
that's right.
1 answer